Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead, cadmium, and zinc ions from water

Adsorption Study for Removal of Mn (II) Ion in Aqueous Solution by Hydrated Ferric (III) Oxides

“…However, dissolved manganese is generally oxidized so slowly that it takes relatively long time for precipitation, hence it hardly becomes cost effective. The oxidation with chlorine becomes more effective when the pH is greater than 9.5 [4], [5].…”

Adsorption of Zn2+ from solutions on manganese oxide obtained via ozone precipitation reaction

“…However, the q e values obtained in the present work by the fi tting with the Langmuir model (Tables 1 and 2) are similar to some values previously reported; for instance: a) q e = 16.3 mg/g for a MnO 2 -modifi ed diatomite 17 ; b) q e = 0.98 mmol/g (64 mg/g), at pH = 4 and nitrate media for a synthetic manganese oxide 16 and; c) q e = 0.83 mmol/g (55 mg/g), at pH = 4 and nitrate media for a hydrous manganese oxide 29 .…”

Evaluation of Adsorption Capacity of Montmorillonite and Aluminium-pillared Clay for Pb2+, Cu2+ and Zn2+

“…The percentage of desorbed metal ion was calculated using the following equation: (11) where: amount des represents the amount of desorbed metal ion and amount ads is the amount of the retained metal ion.…”

“…Heavy metals can damage liver, kidney, bone and nerves by blocking functional groups of vital enzymes. [1][2][3] Various physical and chemical treatment processes such as chemical precipitation, 4,5 ion exchange, 6,7 membrane filtration, 8 coagulation, and adsorption [9][10][11][12] have been widely used to reduce heavy metal content from industrial wastewaters. Nevertheless, most of these methods have several disadvantages, such as complicated treatment process, energy consumption, and are expensive.…”